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"We have [chickens] here," says Regina Wangari as she opens the door to a shack that she recently converted into a coop. "Outside we have almost 20 of them — here in the ghetto."

Wangari lets the chickens roam freely around the slum, nibbling on bits of garbage and grass.

She also raises other animals. In a tight alley behind her shack, she keeps a dozen goats.

And in a shanty nearby, she has rabbit cages stacked from floor to ceiling. There are more than 400 rabbits in the small metal shack.

Raising livestock in the city isn't new in sub-Saharan Africa, but it is a growing trend.

"It's on the increase and — in fact — increasing faster than the rate of urbanization," says Diana Lee-Smith, a food policy expert with the Mazingira Institute, an urban farmers education and advocacy group based in Nairobi.

But Lee-Smith says, in the past few years, there's been a shift in the attitudes of some governments — including Kenya's.

"Local and central governments are beginning to adopt favorable and supportive policies," she says.

That shift is partly due to the benefits of urban farming.

Improving Health, Increasing Wealth

"Livestock products are pretty perishable and hard to move around," says Delia Grace, a public health researcher with the International Livestock Research Institute. She explains that in developing countries where there is little refrigeration, "it makes enormous sense to keep the livestock close [to the cities]."

Grace says the most important benefit of urban livestock in the developing world is its impact on childhood nutrition.

Studies have shown that urban children whose families own animals are healthier than children whose families do not. That's because meat, eggs, and milk have protein and nutrients that are lacking in the diet that many Kenyan children subsist on — corn meal and cabbage.

Regina Wangari, the woman who raises chickens, rabbits and goats, says her four children are healthy and strong.

"They are strong because we have everything here: milk, egg, meat, all those things we get free," Wangari says.

Raising animals has also allowed Wangari to make a good income. She earns nearly a $1,000 a month by selling eggs and chickens. That's an incredible amount of money for a family in this area.

Wangari has invested some of that money in an egg incubator and is now selling more than 700 baby chicks per month, mainly to neighbors who want to breed chickens.

Training New Urban Farmers

Another urban farmer who has enjoyed great success is Francis Wajira. He teaches classes on raising livestock at his home in downtown Nairobi.

"We always have about five to 10 people almost daily visiting me, to come for the training," he says.

Wajira charges about $6 per person, per session. That's a hefty sum for many. The fact that people are willing to pay it shows that they value the instruction.

Two wooden benches serve as Wajira's outdoor classroom. His small yard in a dense Nairobi neighborhood is overflowing with fruit trees, vegetables, and animal pens.

"Whatever small space you have, you can do something," he says. "You can keep a few rabbit, you can keep a few chicken, you can grow vegetables — all over the world."

But there's an irony to the success of urban farmers here.

Regina Wangari, the woman who sells chickens, says her family has saved up enough money to buy a home in a more expensive part of Nairobi. But she hasn't found a nice neighborhood that will let her keep animals.